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Two-Choice, Observational Learning and Reversal in the Rat: S-S Versus S-R Effects

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Two-Choice, Observational Learning and Reversal in the Rat: S-S Versus S-R Effects Animal Learning & Behavior 1983, II (2), 223-228 .Two-choice, observational learning and reversal in the rat: S-S versus S-R effects M. RAY DENNY, R. CHARLES BELL, and CARLA CLOS Michigan State University, East Lansing, Michigan In Experiment 1, male rats were trained to press both bars in a two-choice apparatus and were then given observational training of a go/no-go discrimination in which the observed opera­ tion of two inaccessible, dissimilar bars by a hidden experimenter constituted S+ and 8-. After discrimination was established, individual rats were permitted access to the two bars. Six of the seven rats consistently pressed the S+ bar on 10 test trials, but failed to reverse bar pref­ erence after observational training was reversed. In Experiment 2, nine naive males received the same observational training as in Experiment 1, but without any pretraining to press either bar. All rats pressed the S+ bar on initial test and did so consistently throughout the 10 trials. Six of these rats received reversal training of the go/no-go discrimination after the 10 test trials. As in Experiment 1, all rats failed to press the new S+ bar. However, five of six rats in another group, which received reversal training prior to any test trials, did reverse and press the new S+ bar. In Experiment 3, controls for possible confounding effects of overtraining trials were conducted. These manipulations had no effect; the rats tested before reversal still failed to press the S+ bar, and the rats reversed before testing all reversed or pressed the most recent S+ bar. That is, S-R learning predominated over S-S learning if active, though unreinforced, responding to a particular bar intervened. In contrast, however, a cognitive (S-S) interpretation of directed response learning was supported by the results of Experiment 4, in which the rats that learned the go/no-go discrimination without responding (only by auditory and light cues) failed to press the S+ bar consistently. Over the years it has become increasingly clear when permitted to do so fits a cognitive, or S-S, that the response-reinforcer contingency is not neces­ view of learning, somewhat reminiscent of Tolman's sary for learning an instrumental response (Lajoie (1932) "what leads to what" theory and largely in & Bindra, 1976). As these investigators point out, contrast to the results of the Spence and Lippitt "phenomena of response substitution (Lashley & (1946) latent learning studies. Here it should be em­ McCarthy, 1926), observational learning (Kohn phasized that the old latent learning studies tested & Dennis, 1972), and learning without responding for S-S relations that were irrelevant to the rat's (Dodwell & Bessant, 1960; Solomon & Turner, motivational state, whereas the present study is con­ 1962) demonstrate that a response can be acquired cerned with S-S learning that is relevant. without its reinforcement or even its occurrence In part, the present study can be conceptualized during the training trials" (p. 157). as contributing to an analysis of standard obser­ In the present study, the rat's observation of dis­ vational learning (Del Russo, 1975; Groesbeck & tinctive environmental events with definite hedonic Duerfeldt, 1971; Kohn & Dennis, 1972). Three cues consequences (stimulus sequences) does lead to the can be identified in the standard observational learn­ learning of the appropriate response in the absence ing procedure: the manipulandum, some movement of its occurrence. The rat first watches both positive or change in the manipulandum, and the model. and negative events occur, and demonstrates gol It may well be, however, that the model is a rel­ no-go discrimination that indicates it has learned atively unimportant factor. The observation of these S-S relationships. The learning of the appro­ changes in the manipulandum in correlation with priate response is then indexed by permitting the reinforcement or nonreinforcement may be sufficient animal to make either the response that should pro­ to elicit a full-blown directed response in subsequent duce the positive stimulus event or the one that test trials, as found by Jacobson and Sisemore (1976) should produce the negative event. That an obser­ in human subjects. vation-trained rat makes the appropriate response The standard procedure that evolved at the com­ pletion of Experiment 1 used completely naive rats, ones that had never pressed a bar (manipulandum) This research was supported, in part, by All University Research grants. Requests for reprints should be directed to: M. R. Denny, before. After these rats had learned a go/no-go dis­ Department of Psychology, Michigan State University, East crimination through observing that the experimenter­ Lansing, Michigan 48824. produced movement of one bar (S+) was associated 223 Copyright 1983 Psychonormc Society, Inc. 224 DENNY, BELL, AND CLOS with obtaining food and the movement of the other before they received observational training in the bar (8-) was not, they were given access to the bars tunnel. We were simply concerned with whether to see which one, if either, they pressed. Thus, the the rats would press the bar whose operation was present study can be classified as being similar to uniquely correlated with food. a discriminative autoshaping experiment in which responding to the discriminanda is blocked (Browne, Method Subjects. Seven hooded male rats, approximately ISO days 1976), or as a model-absent observational learning of age and from a colony maintained by the Department of study. Both paradigms share the same elements: Psychology at Michigan State University, were employed as the observation of contingencies and a transfer-of­ subjects. Hooded rats were selected because of their superior training test. vision. The rats were maintained at about 90070 of ad-lib weight and were 23 h deprived of food when run in the experiment. Apparatus. The two-choice observation enclosure is pictured EXPERIMENT 1 in Figure 1. The bars moved by the experimenter from behind the opaque end panel had certain stimulus consequences. The tip of the left bar had a total excursion of 8.5 em and made The general procedure becomes clear from a dia­ a sharp click when it struck the chamber floor. The activated gram of the apparatus used (Figure 1). The rat is right bar had an excursion of 2.2 em, turned on a dim light stationed in the hardware-cloth tunnel looking out above the bar, and produced a faint click from the microswitch. from behind the closed door at the two bars in the Preliminary training. Training the rats to press either bar to receive reinforcement at the end of the tunnel was a laborious test chamber. The hidden experimenter operates task. In nearly every case, the bars had to be baited with wet the bars individually from behind the opaque end mash and the wet mash gradually faded. Shaping was also em­ wall, and the operation of one particular bar (8+) ployed. Presumably the delayed reinforcement involved in en­ is consistently correlated with the presence of food tering the tunnel and traversing its length to the food tray as at the other end of the tunnel. After the rat has well as learning two responses more or less simultaneously made the learning difficult. All rats were trained until they pressed clearly learned to differentiate between the operation a bar within 10 sec of entering the test chamber, and they were of the two bars, it is permitted to enter the test cham­ equally often reinforced on each bar. To effect this equation, ber to see whether it will press the correct bar. a rat was occasionally prevented from having access to a par­ When we first began this research, we seriously ticular bar through use of a clear plastic barrier. Each rat was then given a test for bar preference with either 10 or 11 dis­ doubted that a naive rat that had learned to dis­ crete trials; in every case but one, a preference was determined criminate between the activations of the two bars within 10 trials, with a rat selecting one bar either 6 or 7 times. just by watching from the tunnel would actually In the observational training that followed, the S+ bar was al­ press either bar when they were made accessible ways the nonpreferred bar (four rats trained with S+ bar on during test trials. Consequently, the initial phase the right, three with S+ bar on left). All rats were quickly pre­ trained in the tunnel to leave the food tray and approach the of Experiment 1 involved the conventional training tunnel door by being given a 97-mg food pellet each time they of each rat to press both bars about equally well did this, for a total of five reinforcements. Obse"atlonal training. This phase began on the day follow­ ing the end of pretraining. Trials occurred only when the rat in the tunnel was looking toward the test chamber (Figure I). With very few exceptions, the rats promptly turned toward the tunnel door after visiting the food tray. On S+ trials of the go/no-go discrimination, a 97-mg Noyes food pellet was de­ livered only after the rat had jackknifed around in the tunnel en route to the food tray. This procedure guaranteed that the moving bars and attendant stimuli maintained exclusive stim­ ulus control, of the go/no-go behavior, since the slight noise of the pellet's striking the tray followed the response. Also, the intertrial interval (IT!) was a computer-generated Poisson dis­ tribution of time intervals, with a mean of 10 sec and a range of I to 60 sec, so wait-time could not become a reliable cue for leaving the tunnel door and approaching the food tray.
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